 Its product line ultimately included instrumentation for all cardiac-related medical procedures, including electrocardiography, electrophysiology, echocardiography, and patient monitoring.Its DR and VR series physiological recorders were used in almost every cardiac catheterization laboratory from the 1950s well into the 1980s, and are widely mentioned in cardiology papers of that era (e.g.,).It was initially developed for André Cournand of Columbia University, who shared the Nobel Prize for Medicine with Dickinson W. Richards and Werner Forssmann for work exploring the interior of the heart.